The 3 main villains: Megatron, The Fallen, and Sentinel Prime have all had their share of being the main villain, Megatron in TF1, Fallen in 2, and Sentinel Prime in 3. So, when TF4 comes out, who or what should be the main villain? The possibilities are endless. It could be Megatron again. Or even better. GALVATRON! It could be Nemesis Prime. That'd be cool. My personal favorite possible future villain. Or maybe Unicron. What do you think the next main villain should be?